Light-sensitive material and process for the production of photographic prints



Patented Nov. 10, 1931 UNITED STATES PATENT OFFICE mx RAEOK, OF DESSAU-ZIEBIGK, .ANHALT, GERMANY, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO 'AFGA ANSCO CORPORATION, OF BINGHAMTON, NEW YORK, A CORPORA- TION OF NEW YORK LIGHT-SENSITIVE MATERIAL AND PROCESS FOR THE PRODUCTION OF PHOTO- GBAPHIC PRINTS No Drawing. Application filed February 24, 1928, Serial No. 256,810, and in Germany February 28, 1927.

a sulfonic acid of a 1.2-quinone of the naphthalene series.

I found that salts of sulfonic acids of a 1.2-quinone of the naphthalene series are very sensitive to light and are readily destroyed by the influence of light. According to the invention paper, or paper which is coated with a gelatin layer, glass or celluloid film, is made sensitive to light by application of a solution of a salt of a sulfonic acid of a 1.2-quinone of the naphthalene series and is exposed, for instance, under a drawing on tracing cloth and then developed with an organic compound which contains one or more amino-groups, whereby a positive picture is produced directly. I

The following examples illustrate my invention Example 1.--A paper which has been satu-.

rated with a solution of potassium 1.2-naphtho-quinonei-sulfonate of 2 per cent. strength and then dried, is exposed to light under a black and white drawing and then developed in a solution of aniline-hydrochloride of 1- per cent. strength. The parts protected from light appear red on a colorless ground.

E wample- 2.Paper is coated with a solution of gelatin which contains potassium 1.2- naphtho-quinone-4-sulfonate. After drying and exposure to light un der a black and white drawing it is developed in an aqueous solution of 1-methyl-24-diaminobenzene of 1 per cent. strength. The picture is in Bordeaux red.

Example 3.A gelatin solution containing potassium 1.2-naphtho-quinonel-sulfonate is poured upon glass. After drying and exposure to light under a black and white drawing the plate is developed by a solution of 1 amino 4- hydroxybenzene. The picture produced is violet.

Instead of potassium 1.2-naphtho-quinone- 4-sulfonate there may be employed in the preceding examples salts of other sulfonic acids of a 1.2-quinone of the naphthalene series, for instance, ammonium 1.2-naphtho-quinone-4.6-disulfonate or sodium 1.2-naphthoquinone-G-sulfonate.

I claim:

1. The process of making photographic prints which consists in exposing to light under :1 positive a support coated with a salt of a sulfonic acid of a 1.2-quinone of thenaphthalene' series and developing the exposed light- 3. The process of making photographic.

prints which consists inexposing to light behind a positive a support coated with a salt of 1.2-naphthoquinonel-sulfonic acid and developing the exposed light-sensitive surface with an organic compound containing an amino group.

4. The process of making photographic prints which consists in exposing to light behind a positive a support coated with a salt of 1.2-naphthoquinone-4-sulfonic acid and developing the exposed light-sensitive surface with a compound of the. benzene series containing an amino group.

5. Light-sensitive materials com rising a support coated with a salt of a sul onic acid of a 1.2-quinone of the naphthalene'series.

6. Light-sensitive materials comprising a support coated with a salt of 1.2-naphthoquinone--sulfonic acid.

In testimony whereof, I afl'ix my signature.

MAX RAECK; 

